Ki-67 expression in vulvar carcinoma. Preliminary results

Area of Science:

• Oncology
• Pathology
• Biomarkers

Background:

• Vulvar cancer diagnosis and prognosis require reliable biomarkers.
• Proliferating cell nuclear antigen (Ki-67) is a marker of cellular proliferation.
• Understanding Ki-67 expression patterns may offer new prognostic insights.

Purpose of the Study:

• To investigate the diagnostic and prognostic value of Ki-67 expression in invasive vulvar cancer.
• To correlate Ki-67 reactivity patterns with clinical outcomes.

Main Methods:

• Analysis of Ki-67 expression in 73 invasive vulvar cancer cases.
• Identification of distinct Ki-67 reactivity patterns: diffuse and focal.
• Sub-classification of focal patterns based on MIB-1 positivity percentage (0-6% vs. 7-9%).
• Correlation of Ki-67 patterns with histotype, lymph-nodal status, FIGO stage, grading, and mitoses count.

Main Results:

• Two main Ki-67 reactivity patterns were observed: diffuse and focal.
• Diffuse Ki-67 positivity was associated with a poor prognosis.
• Focal Ki-67 positivity showed different prognoses based on MIB-1 levels (0-6% better than 7-9%).
• Ki-67 distribution correlated significantly with histotype, lymph-nodal status, and FIGO stage.
• No significant correlation was found between Ki-67 distribution and grading or mitoses count.

Conclusions:

• Ki-67 expression patterns are valuable diagnostic and prognostic factors in invasive vulvar cancer.
• Diffuse Ki-67 positivity signifies a worse prognosis.
• Focal Ki-67 patterns, particularly with lower MIB-1 levels, suggest a better prognosis.
• Ki-67 serves as a potential biomarker for stratifying vulvar cancer patients.